python 爬虫爬取地理空间高程图GDEMV2 30m 中国地形

一.配置Python 爬虫环境

from selenium import webdriver
import time
# from selenium.webdriver.common.action_chains import ActionChains
from selenium.webdriver.common.by import By

from selenium.webdriver.common.keys import Keys
# from selenium.webdriver.common.keys import Keys  PhantomJS浏览器创建器对象

这是头文件需要用到的库。我们首先要配置selenium。我们还需要去下载Web驱动。

我直接放到的 python.exe 那个目录里了。

二.理解爬虫写爬虫

我们需要访问网页的元素。并用代码代替人为的操作。

1.访问地理空间数据云

driver = webdriver.Chrome()
driver.get('https://www.gscloud.cn/accounts/login_user')

2.登录

driver.get('https://www.gscloud.cn/accounts/login_user')
email = driver.find_element(By.ID,'email')
email.send_keys('3559216518@qq.com')
passport = driver.find_element(By.XPATH,'//*[@id="password"]')
passport.send_keys('GWX072551a')
captcha=driver.find_element(By.XPATH,'//*[@id="id_captcha_1"]')
captcha_sj=input('请输入验证码：').strip()
captcha.send_keys(captcha_sj)
time.sleep(3)
driver.find_element(By.XPATH,'//*[@id="btn-login"]').click()
time.sleep(3)

3.跳转页面

driver.find_element(By.XPATH,'/html/body/div[1]/div[1]/div[2]/ul/li[2]').click()
time.sleep(3)
#//*[@id="dataset-btn"]/img
driver.find_element(By.XPATH,'//*[@id="dataset-btn"]/img').click()
time.sleep(3)
driver.find_element(By.XPATH,'//*[@id="all-datasets-dlg"]/div/div[2]/div/div[2]/ul/li[1]/span[1]').click()
#driver.find_element(By.XPATH,'//*[@id="all-datasets-dlg"]/div/div[2]/div/div[2]/ul/li[4]/ul/li[1]/div/label/span[2]').click()  //*[@id="all-datasets-dlg"]/div/div[2]/div/div[2]/ul/li[1]/span[1]  //*[@id="all-datasets-dlg"]/div/div[2]/div/div[2]/ul/li[4]/span[1]
#//*[@id="c421"] //*[@id="all-datasets-dlg"]/div/div[2]/div/div[2]/ul/li[4]/span[1]
time.sleep(3)
driver.find_element(By.XPATH,'//*[@id="all-datasets-dlg"]/div/div[2]/div/div[2]/ul/li[4]/span[1]').click()
time.sleep(3)
driver.find_element(By.XPATH,'//*[@id="c421"]').click()
time.sleep(3)
driver.find_element(By.XPATH,'//*[@id="all-datasets-dlg"]/div/div[3]/button[2]').click()
# //*[@id="condition-panel"]/div[2]/div[2]/div
time.sleep(3)
driver.find_element(By.XPATH,'//*[@id="condition-panel"]/div[2]/div[2]/div').click()
# //*[@id="condition-panel"]/div[2]/div[2]/div/label[2]
time.sleep(3)
driver.find_element(By.XPATH,'//*[@id="condition-panel"]/div[2]/div[2]/div/label[2]').click()
# //*[@id="lng_input_1"]
time.sleep(3)
#70 135   15 55
LeftJinDu = driver.find_element(By.XPATH,'//*[@id="lng_input_1"]')
LeftJinDu.send_keys('70.5')
# //*[@id="lng_input_2"]
time.sleep(3)
LeftJinDu = driver.find_element(By.XPATH,'//*[@id="lng_input_2"]')
LeftJinDu.send_keys('134.5')

time.sleep(3)
LeftJinDu = driver.find_element(By.XPATH,'//*[@id="lat_input_1"]')
LeftJinDu.send_keys('15.5')

time.sleep(3)
LeftJinDu = driver.find_element(By.XPATH,'//*[@id="lat_input_2"]')
LeftJinDu.send_keys('54.5')
#//*[@id="search-btn"]
time.sleep(3)
driver.find_element(By.XPATH,'//*[@id="search-btn"]').click()
time.sleep(3)
driver.find_element(By.XPATH,'//*[@id="search-btn"]').click()
time.sleep(3)

会一步一步点击元素，跳转到这个页面

三.下载数据

page_num=222
page=1
page_sr = driver.find_element(By.XPATH,'//*[@id="pager"]/div/table/tr/td[7]/input')
# //*[@id="pager"]/div/table/tr/td[7]/input
page_sr.clear()
page_sr.send_keys(page)
page_sr.send_keys(Keys.RETURN)
time.sleep(10)


while page<=page_num:
    print('当前下载第{}页'.format(page))
    for tr_num in range(1,11): #只能取到3-12
        d_everypage='//*[@id="result-listview"]/div/table/tr['+str(tr_num)+']/td[2]/div/div/a[2]/span/img'
        download=driver.find_element(By.XPATH,d_everypage).click()
        print(d_everypage)
        time.sleep(60)  #每个下载时间给20秒
    page += 1
    page_sr = driver.find_element(By.XPATH,'//*[@id="pager"]/div/table/tr/td[7]/input')
# //*[@id="pager"]/div/table/tr/td[7]/input
    page_sr.clear()
    page_sr.send_keys(page)
    page_sr.send_keys(Keys.RETURN)
    time.sleep(15)
input()